McQuay M4MC User Manual

MCQUAY Service Guide Book Diagnosis
51
Water Source Split Unit – Wall Mounted G Series
Model
Model Board Handset
M5WMWS 10/15/20/25GR LWS2.0 G17 / SLM3 / Netware 3 / SLM8
SLEEP
(Red)
POWER
(Green/Red)
TIMER
(Orange)
IONIZER
(Green)
Error Code
(SLM3 /
Netware 3)
Operation / Faulty
Indication
Action
- Cooling mode -
- Heating mode -
-
Auto mode in
heating operation
-
-
Auto mode in
cooling operation
-
- Timer On -
- Sleep mode On -
- Ionizer On -
- Fan mode On -
- Dry mode On -
E1
Room air sensor
contact loose /
short
Check room sensor
connection / change
room sensor
E2
Indoor coil sensor
contact open
Check indoor coil
sensor connection /
change indoor coil
sensor
E3
Outdoor coil sensor
contact open
Check outdoor coil
sensor connection /
change outdoor coil
sensor
E4
Compressor
overload protection
/ Indoor / Outdoor
coil sensor short
If running ampere
highly increase, change
the compressor. If not,
replace the coil sensor
Heat LED
blinking
(SLM3 only)
Defrost mode -
E5 Gas leak
Check for leakage &
repair / Top up
refrigerant
E8
Hardware error
(tact switch pin
short)
Check for the tact
switch pin condition
/
ON ON or OFF BLINKING
/
/
/
/
/
/
/
/
/
/
Green
Red
Red
Green
1 time
3 times
2 times
1 time
Red
3 times
6 times

McQuay M4MC Specifications

General

Brand	McQuay
Model	M4MC
Category	Air Conditioner
Language	English